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<pre class="textdiagram" id="fig58">
+------------+               +------------+
|            |               |            |
|  Primary   |<------------->|   Backup   |
|  "master"  |               |   "slave"  |
|            |               |            |
+------------+               +------------+
      ^
      |
      |
      |
+-----+------+
|            |
|   Client   |
|            |
+------------+
</pre>
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